Duplex vibrating table



DUPLEX VIBRATING TABLE Filed Aug. 19, 1929 i/ 9\ 0 9 f/ /10 r @1/ Tl@ 76 lli Patented Jan. v1931 i cuirsk .srATEs JENs JOHANNES JENSEN, or corENHAeE-N, nENivrAr-tii, AssIGNon ro MEssR-s." isocr-v GILD a JAooBsEN, or GOPENHAGEN, DENMARK Y v DUPLEX vIBaATiNG TABLE A Ylimitation sied August 19,1929, serial No. 387,034., 2.11am cermany'septembef 7, 1928;

Table devices arelmown by which the vi-.

bratory motion is produced iii that the table device supported by horizontalV and vertical springs is set into motion by means of an eccentric shaft. This shaft, however, will produce vibrations radiating radially in all diiections, whereby under certainy circum-A stances an unnecessarily intense shaking will be effected.

Instead of using one eccentric shaft for producing the vibrato-ry motion the; present invention employs two or more `eccentric shafts arranged in pairs and rotating in opposite directions. Hereby a `portion of the vibratory motions produced by the eccentricity ofthe shaft will be compensated, in such .a manner that for instance in the case of horizontal juxtaposed shafts only vertical oscillations will occur.

The drawing shows by way of example one construction of the novel device,

with supporting bearings for two eccentril rigid frame `ie a Wai 'be' evident' that the partssubjected to vibration in the vertical direction are the bushings 7, the transverse y pieces 4, the brackets 9, the springs 10, the f frame 1, the chainsB 'and the moulds 2.

Referring to the position of the bushings 7,

in. Fig2 Vit will befnotedthat the ,prominent portions ofboth of them are located above the V'shafts 6 which latter occupy their lower position, and-as the two vvbushings revolve together at the same rate but in opposite directions it is evident that the prominent portions thereof simultaneously arrive at their upper and lower points, whereas in passing through `the intermediate stages. of their rotary motion, the eccentrics move in oppositi on to each cally bored bushings for shafts 6, 6, the said'k bushings being interconnected by .means of spur gears 15. The bushings 7 are journalled in ball bearings 8. By means of brackets 9 the said transverses 4 are bolted on to plate springs 10 attached toa rigid frame 16'.` By

Y means of suitabledevices not shown on the drawing the bushings 7, and thereby the shafts 6 may be caused to rotate rapidly, and as the shafts rotate in opposite directions Y l'they will be able to impart tothe frame 1 a other, that is to say, at one stage of their revolution they are widely separated, being disL posed outwardly of the shafts 6, and at an other stage of their rotaryV movement Vthey are disposed adjacent .each other withv theV Vshafts 6 lying outwardly or widely spaced.

Thus, during the rotary movement Vofthe ec centric `bushings arshaling movement or im pulse is imparted tothe table at the moments when the prominent parts of the ecc-entries simultaneously arrive at their Vupper and 'lower points while during the movement of the eccentrics through the intermediate stages of their rotary movement, the effect of one eccentric isV offset `or neutralized'by Ythe other, and therefore no Yvibratory movement'of the table in the'horizontal directionl SUv occurs. n Thus, the lwhole Vframe willhave only'a vertical movement which; is accommo- .sa y

dated by the resilient springs V10. Itis fur- Y ther evident-that during the rotary move-l ment of the-two eccentricbushings, the shafts axis of which coincides with the axis of the external surface of the eccentric bushings 7. By disposing the Yshafts below one another :the table may be given avibratory motion in horizontal direction. A still' greater vnumberV of eccentric shafts may ofcourse also be f used, for instance fouror six.

Having now described my invention, what l' I claim as new yand dere t9 599111)@ by Let- In combination, a vibrating frame including cross pieces, eccentrically bored bushings, shafts mounted in the eccentric bores of the bushings, bearing for said bushings fitted in said cross pieces, a pair of intermeshing gears `miapted to revolve uniformly in Vopposite directions connecting said bushings. l

In testimony whereof I aIiX :my signature.

JENS JOHANNES JENSEN. 

